I think it's a villain from one of the old, old, from way back from the old comics. It is a Batman villain... It's not going to be the Joker.

E! speculates that Oldman was referencing Hardy as Bane, however, considering the character wasn't created until 1993, that seems unlikely. Earlier this month, a rumor spread of a Dark Knight Rises villain that dates back to the 1960s and was present in 2005's Batman Begins (if we haven't spoiled it already, go here to be spoiled further). While certainly no confirmation, Oldman's comments seem more likely to be referencing those rumors.

Another possibility is Two-face, played by Aaron Eckhart in The Dark Knight. While Eckhart has continually denied he would reprise his role in the The Dark Knight Rises — the latest being Eckhart's admission that director Christopher Nolan told him he wouldn't return last December — Eckhart seemed to change his public stance during a recent interview.

Speaking with a CBS News reporter (via MTV), Eckhart responded to the fact that he would not return by saying, "I'm not?" When asked to clarify whether he would return as the character, Eckhart's smiling response was: "I could not possibly say."

While it's highly likely that Eckhart was simply messing with the (seemingly teenage) reporter, the huge amount of secrecy surrounding the movie essentially leaves every possibility in the open.

We can say that the villain isn't Rutger Hauer, who played Wayne Enterprises CEO William Earle in Batman Begins. "I think not," Hauer told Entertainment Weekly of a possible return in The Dark Knight Rises. "I would have heard about it."